The following reconstruction of the events surrounding Mallory and Irvine’s summit attempt in 1924 is the combined result of three search expeditions to Mount Everest (in 1999, 2001, and 2010) and associated research. The timeline was compiled from the following sources:

Somervell descending from C 4 to C 3 in the afternoon, arriving 5:30 p.m.; next day down to BC (C3 diary; Norton 4, ibid.).

On this day, Geoffrey Bruce sent the following message from C 3 to C 4, which was found with Mallory’s body in 1999:

~~~

Dear Mallory,
Herewith 2 tins Bully Beef, 2 tins Bovril, 1 tin Meta, 1 tongue, 1 tin Foie, + 1 tin Biscuits
Also 1 tin Mixed Petrol & Oil from dump.
The porters have instruction to pick up the oxygen cylinders put aside by you at the dump.
For coolies: 1 tin Biscuits, 1 lb. Salt
Let us know developments as soon as you can. Hazard is off to the Base today!
Hingston, Noel, & I are ready for any emergency.
Do you want me up yet? I think I could manage to do a bit, though my heart is undoubtedly a bit ”worky”.
Yours
Geoffrey Bruce

~~~

As the note is dated “Camp III, 5 June”, it must have been brought up by Hazard with the requested supplies the same day.
The remark, “Hazard is off to the Base today”, refers to the original plan before Hazard was signalled to go back to C 4 in the morning of 5 June.
Bruce’s remark about the condition of his heart refers to the after-effects of his load carrying efforts at C 5 during the attempt with Mallory on June 1st.

Weather that day: “A brilliant day with a maximum temperature of 105°, though the air temperature never rose above freezing.” (Norton 4, p. 124)

Personal loads “consisted of the modified apparatus with two cylinders only and a few other small items such as wraps and a food ration for the day, amounting to not more than perhaps 25 lb.” Porters’ loads are described as containing bedding, provisions and spare oxygen cylinders (Norton 4, p. 125).4 porters return from C 5 soon after 5 p.m. (Norton 4, p. 125), reporting that Mallory & Irvine were “travelling well” (Odell, p. 266; Norton 3, p. 13) and bringing down note from Mallory to Odell:

~~~

Dear Odell,
Here with Ang Tenjin Tewang Nimija Dareda
The first is anxious to go down to III & as he has done well I should be glad if you could let him go.
The provision rucksack which he carries has been pretty well gone through by us.
No wind here & things look hopeful.
G.M

~~~

The fairly late returning time of the porters indicates that the going time of the party must have been comparable to the first attempt by Mallory & Bruce on June 1, when they set off from C 4 with 8 porters at 8:30 a.m. (Irvine, p. 109; C4 diary states 6:10 a.m., probably illegible writing meaning 8:10 a.m.) and 5 of the porters returned to C4 in the afternoon (Irvine, p. 109; Norton 4, p. 97).

Norton 3 gives 5 hours 10 min as average time for the ascent from C 4 to C 5, based on 3 recorded ascents (presumably Norton & Somervell and 2x Odell, or 1x Odell and Mallory & Bruce) and 1 hours 35 min as average time for the descent, based on 2 recorded descents (presumably Norton & Somervell and Odell).

If Mallory and Irvine’s party took an average of 5 hours to climb from C 4 to C 5, arriving there around 2 p.m., and assuming a more conservative 2 hours for the porters’ descent to arrive back at C 4 soon after 5 p.m., this would result in a very plausible scenario of the porters staying at C 5 for about 1 hour before descending.

In contrast, any assumption of a considerably faster climbing time by Mallory’s party would by default result in an unduly long stay of the porters at C 5, given that their late returning time is known.

The significance of this for the reconstruction of Mallory & Irvine’s final climb will be further explained in the section dealing with the events of June 7 (see 3.).

Weather that day: “Though a brilliant morning, it [was] very cloudy in the afternoon and even snowing a little in the evening.” (Norton 4, p. 125) No wind at C 5 (see Mallory’s note previous page).

3. June 7, 1924

Mallory & Irvine + 4 porters from C 5 to C 6, “going exceedingly strong with oxygen” (Norton 1, p. 216, quoting porters). From comparison with previous ascent times and returning times of the porters (see below) Mallory & Irvine must have reached C 6 between noon and 1 p.m. at the latest.

Odell + 2 porters from C 4 to C5, starting 10 a.m. (C4 diary; Norton 1, p. 222), on way up finds oxygen set without mouthpiece, carries it up to C 5 (Norton 4, p. 126; in this account, p. 127, Odell says that only one porter, Nima, had accompanied him; C4 diary also stated only 1 porter).

His comment, ”I had expected on my way up to Camp V to find a spare oxygen breathing set that had been left there earlier” (Norton 4, p. 126), indicates that it was not an abandoned set from Mallory & Irvine’s party, but from a climb before June 6th. As Mallory & Bruce’s party did not carry oxygen on June 1st, it could only have been the set Mallory & Odell had taken up when meeting Norton & Somervell on their return from the mountain on June 4th.

Shortly after Odell’s arrival, the 4 porters of Mallory’s party return to C 5 (Norton 3, frontispiece, indicates at about 3 p.m.) and later to C4, arriving there 5 p.m. (C3 & C4 diaries), bringing down two notes:

~~~

Dear Noel,
We’ll probably start early to-morrow (8th) in order to have clear weather.
It won’t be too early to start looking out for us either crossing the rockband under the pyramid or going up skyline at 8 p.m. [sic]
Yours ever, G. Mallory
~~~

Dear Odell,
We’re awfully sorry to have left things in such a mess – our Unna cooker rolled down the slope at the last moment.
Be sure of getting back to IV to-morrow in time to evacuate before dark as I hope to.
In the tent I must have left a compass – for the Lord’s sake rescue it, we are without.

To here on 90 atmospheres for the 2 days – so we’ll probably go on 2 cylinders – but it’s a bloody load for climbing.
Perfect weather for the job!
Yours ever
G. Mallory

Weather that day: “That evening […] the weather seemed most promising. […] Even the wind did not attain its usual boisterous degree.” (Norton 4, pp. 127f.)

3.1. Comments on Mallory’s note to Noel

In various sources it has been suggested that the place Mallory wanted Noel to start looking out for him & Irvine referred to the Second Step, and that Mallory & Irvine were therefore almost 5 hours late when last seen by Odell the next day. The first interpretation of the note in this way occurred already at C3 on June 7th, when an entry in the camp diary by Geoffrey Bruce states, “[The porters] brought a very optimistic note from Mallory saying that Noel should look out for them at the base of the final pyramid at 8 a.m. to-morrow” (emphasis added).

Yet there is no indication in the note for this assumption. The note rather seems to indicate that Mallory had at this point not totally ruled out Norton’s route as an alternative to the ridge – so he couldn’t say whether he and Irvine would be traversing the Yellow Band (which eventually means crossing both rock bands below the final pyramid) or emerging atop the ridge crest by 8 a.m. (not p.m.) the next morning. Expecting an early start, say at 5 a.m., and using oxygen, it was not unreasonable for Mallory to assume he could reach the crest in 3 hours from C 6.

Odell seems to have followed a similar way of thinking initially: ”I was surprised [...] to see them so late at this, namely, 12.50, at a point that, according to Mallory’s schedule, should have been reached by 10 a.m. at latest.” (Odell, p. 268, emphasis added). This indicates that Odell, too, had read Mallory’s note to Noel as saying he and Irvine had intended to reach the crest of the ridge at 8 a.m., and Odell deduced they would then have reached the Second Step 2 hours later – again not unreasonable, given the scant knowledge at the time of the true difficulties of the ridge. In the official account, however, he assumes from Noel’s note that Mallory had hoped to reach the Second Step by 8 a.m. (Norton 4, p. 130).

3.2. Comments on Mallory’s note to Odell

Odell’s comment on the loss of the stove: “[It was] an occurrence which meant cold supper and breakfast for me!” (Odell, p. 266). Not bringing a stove on his own indicates that Odell had expected to find one - Mallory & Irvine’s - at C 5. That Mallory & Irvine continued despite the loss of their stove in turn indicates that they had expected to find a second stove – Norton & Somervell’s – at C 6.

In the context of the previous timings, it now becomes obvious that the consumption of 90 Atm. (400 liters) of oxygen in two days clearly could not have meant they had used it continuously. Used at 1.5 l/min, the supply would have lasted 4 h 25 min for the combined ascent from C 4 to C 6 or even less when used at a higher rate (see Holzel/Salkeld, p. 224). This would assume an unreasonably fast ascent time, even with oxygen, and is furthermore contradicted by the late returning times of the porters. To explain the latter otherwise, the porters would have to have spent a couple of hours at each of the camps, which seems unlikely.

Rather than indicating a fast ascent time, the low oxygen consumption mentioned in Mallory’s note to Odell suggests that Mallory & Irvine had used only little oxygen over the two days of ascent to C 6. This had been Mallory’s intention all along, as documented in Norton 4 (p. 116):

“As Mallory and I lay in our tent, he explained that he had decided that [...] he was determined to make one more attempt, this time with oxygen, and how he had been down to Camp III with Bruce and collected sufficient porters to enable the attempt to be staged.”

This sentence is footnoted: "It may be asked how it came that sufficient porters were now available for an attempt with oxygen, seeing that we had decided against an oxygen attempt at Camp I on grounds of inadequate transport. Mallory and Irvine decided to use practically no oxygen up to Camp VI [...] And, lastly, Camp VI having been established with tents and bedding by Somervell and me, nearly every available porter could now be used for carrying oxygen cylinders." (emphasis added)

And, as a consequence of this combination, almost every oxygen cylinder would have been available on summit day.

3.3. 3.3 Some notes on the oxygen question

Judging Mallory & Irvine’s chances for a summit success depends to a large degree on the oxygen supply available to them.

After deciding to make a further attempt with oxygen, Mallory & Irvine had climbed to C 4 on June 4, stopping en route to pick an unspecified number of oxygen cylinders from a dump (Irvine, p. 111). It is unknown how many bottles they had been carrying themselves – probably a total of 2 or 4. It is also unknown whether the two accompanying porters also carried an oxygen set and bottles.

The bottles picked from the depot were carried to C 4 by five porters on June 5 (see C4 diary and note from G. Bruce quoted under 1.). Because of their weight and the restriction of a porter’s load, no porter should have carried more than 3 bottles, thus resulting in a total number of 15 or less.

The last image taken of Mallory & Irvine leaving the North Col on June 6 shows both climbers carrying oxygen apparatus. Odell wrote that both carried 2 bottles each, although in Mallory’s case only one bottle is clearly discernible. Porters’ loads are described as containing bedding, provisions and spare oxygen cylinders (Norton 4, p. 125). This is confirmed by another note found on Mallory’s body in 1999. Among the listed items are 6 bottles of oxygen.

Four (4) porters accompanied Mallory & Irvine on their climb from C 5 to C 6 on June 7. Above C 4, a porter’s load was restricted to 9 kg (20 lbs.; see Norton 4, p. 102) – so none of the porters probably carried more than 2 bottles (16 lbs.). The carrying capacity of the party thus approximates the load listed on Mallory’s note: 3 porters for 6 bottles of oxygen plus 1 porter for provisions and other equipment from C 5. At most the porters could have carried a total 8 bottles, leaving 16 lbs. for additional equipment and provisions.

The key points of Mallory’s plan, as discussed with Norton (see 3.2) had thus been accomplished: The porters had carried a maximum number of oxygen cylinders to C 6 – 6 or perhaps even 8 -, and Mallory & Irvine had used “practically no oxygen up to Canp VI” – ¾ of one bottle each. As Mallory & Irvine had carried 3 or 4 bottles themselves, this would have added 1 or 2 more to the total supply at C 6.

A total supply of 8 to 10 bottles would have been sufficient for a full-scale oxygen attempt at the summit, using 3 cylinders per climber. Even then, they would still have had 1 bottle each for sleeping and perhaps also replacements for leaking cylinders.

But the ascent to C 6 with little oxygen and the carry of 2 bottles prompted two conclusions from Mallory, which had a bearing on his plans for the summit climb as noted to Odell (see 3.):

a) at this altitude, even 2 bottles were a “bloody load for climbing”

b) as they had been able to climb to C 6 using little oxygen, they could save weight and go for the summit with only 2 bottles instead of 3

To this date, we know approximately how many oxygen bottles had been available to Mallory & Irvine prior to their summit bid. Mallory’s note to Odell indicated how many bottles they “probably” used.

Five bottles is probably too small a number to refer to the supply picked from the dump at the base of the North Col on June 4. The number also doesn’t correspond to the later porters’ load of six (6). Perhaps it is also of significance that Mallory wrote down this important data on the envelope of a personal letter he carried with him – and not, like his other notes, on a page of his diary.

Did Mallory opt for a compromise on summit day and had Irvine carry 3 bottles, while he took just 2 as indicated in his note to Odell?

4. June 8, 1924

4.1. Mallory & Irvine’s ascent to 8500 m/28,000 ft.

Mallory & Irvine left C 6 for the summit sometime in the morning of June 8, 1924. Although Mallory had written to photographer John Noel (in his note of the previous day) that they intended to leave “early”, we don’t know if they had indeed managed to do so. However, the following points should be noted:

Norton & Somervell had originally planned to set off from C 6 at 5:30 a.m. and would probably have done so if they hadn’t been delayed by their need to replace the liquid from a leaking thermos. The two eventually left Camp VI at 6:40 a.m.

None of the summit parties of the British pre-war expeditions managed to leave C 6 earlier than 5:30 a.m., in most cases due to the extreme cold before sunrise.

Magnesium flares, a candle lantern and an electric torch later found at the 1924 C 6 strongly suggest that Mallory & Irvine started their climb after sunrise, when it was already light enough to see. They would not have been aided by moonlight, as the moon had already set before midnight. Sunrise had been at 4.45 a.m. that day.

The only conclusion that can be drawn so far is that Mallory & Irvine are likely to have left Camp 6 for the summit sometime between 5 and 7 a.m.

To this day, all traces that have ever been found of Mallory & Irvine’s movements above C 6 (with the exception of Mallory’s body) were discovered along a 200-metre-long stretch of the Northeast Ridge between the exit from the Yellow Band (just SW of the twin rock towers) at 8440 m/27,690 ft. and the base of the First Step at 8500 m/27,890 ft. (see Mallory & Irvine: The Discoveries 1924-2010)

The most common interpretation of the traces is that one of them – oxygen bottle No. 9 – was left behind on the ascent, while the other two – Irvine’s ice-axe and an old woollen mitten presumably from 1924 – were left behind on the descent.

The location of the bottle has subsequently been established as being c. 170-180 m horizontally away from the top of the First Step (i.e. down the ridge, or to the NE), at an altitude of c. 8470-8475 m/27,790-27,806 ft.

There is, however, some uncertainty about the exact location and circumstances of the bottle’s rediscovery. Dave Hahn appeared to recall seeing an old oxygen bottle sticking out of the snow below the exit from the Yellow Band during the ascent. A sherpa had picked up this bottle and later cached it higher up the ridge. From the testimonies of Hahn and Richards it isn’t entirely clear whether the bottle seen by Hahn on the ascent was the same later recovered by Richards on the descent – or if the bottle found by Richards was another, second, bottle.

From the notes on the envelope found with Mallory, bottle No. 9 contained 110 atmospheres of oxygen, or 11/12 of the full content of 120 atmospheres. This equals a content of 490 litres of oxygen.

The flow rate recommended by medical experts in 1924 for climbs above C 6 was between 2 and 2.5 litres per minute. In this case, bottle No. 9 would have lasted 196-245 minutes, or 3¼ - 4 hours, if used continuously.

Assuming continuous oxygen usage at a constant flow rate, bottle No. 9 might indicate that Mallory and Irvine took between 3¼ - 4 hours to climb from C 6 (8140 m/26,707 ft.) to a point on the Northeast Ridge somewhere between c. 8420 m/27,626 ft. and 8475 m/27,806 ft.
Given the many uncertainties in both the departure time from C 6 and the exact location of bottle No. 9, the most optimistic estimation is that Mallory and Irvine reached a point close to the base of the First Step around 8:30 a.m. (i.e. roughly in accordance with Mallory’s schedule, as written in his note to Noel) – but they could have arrived at this point considerably later.

If the place where the bottle was recovered in 1999 does indeed mark the spot where it had been discarded in 1924, then bottle No. 9 is to this date the highest trace ever found of Mallory and Irvine. There is no further hard evidence about their ascent beyond this point.

They could have traversed along the top edge of the Yellow Band, thus bypassing the First Step low down. The experiences of later parties have shown that it becomes at least very difficult to regain the Northeast Ridge beyond the First Step, and that a party following this low line is almost certainly forced to traverse into the Great Couloir.

They could have climbed the First Step either along the ridge or by the open gully in its northern face (i.e. today’s standard route) and continued along the ridge toward the Second Step.

Assuming that the essence of Odell’s sighting is correct – i.e. that he did indeed see the two climbers and had not hallucinated or was deceived by an optical illusion (something Odell forcefully denied throughout his life) -, his sighting has been interpreted in two basic ways:

Odell saw Mallory & Irvine on the ascent. They had chosen the crest of the Northeast Ridge and were either climbing the First or Second Step (or even the Third Step) at 12:50 p.m.

Odell saw Mallory & Irvine on the descent. On the ascent they had bypassed the First Step low down and subsequently failed to either regain the ridge beyond the step or to cross the Great Couloir. On their retreat they had climbed the First Step for reconnaissance purposes, and were seen doing this at 12.:50 p.m.

With no hard evidence about the route they took beyond oxygen bottle No. 9, both theories carry equal weight. However, circumstantial evidence let me favour the interpretation that Mallory and Irvine were still on the way up when last seen by Odell – and they were not at the First Step.

The reasons are as follows:

Odell’s diary entry, written within the first six days after his sighting, simply says:“At 12.50 saw M. & I on ridge nearing base of final pyramid.”
This strongly suggests a point at or above the Second Step.

Throughout his accounts written in 1924, Odell remained convinced that he had seen Mallory and Irvine climbing the Second Step. Only in the expedition book, which appeared in 1925, doubts had entered his mind – and with them the possibility that he had seen the climbers on the lower First Step As Tom Holzel and Audrey Salkeld put it so eloquently in their seminal work (p. 249):

“The main reason Odell would cling so tenaciously to the key elements of his vision … is because he cannot do anything else: that is how it was. To have it otherwise, he would need to invent. The inconsistencies in his account only began to creep in when he felt compelled to change the location of his sighting.”

The topography described in Odell’s accounts doesn’t match the First Step. Odell described one of the climbers appearing on “top of the step”, while the true top of the First Step is never crossed when following any of the routes used to either bypass or climb the First Step.

This last point is obviously the weakest, as the topography described in Odell’s accounts doesn’t fit the Second Step either. Odell described the climbers moving over a “snow patch”. While there is a prominent snow patch at the base of the First Step, the patch at half height of the Second Step is comparatively small and in the shadows most of the day – not an obvious place to spot two climbers. Moreover, Odell’s accounts don’t indicate the climbers belaying or supporting each other, as one would expect on a pitch of such apparent difficulty as the Second Step.

It was for these latter reasons that I considered it for a long time a possibility that Odell had seen Mallory and Irvine at the Third Step (something first proposed in 1981 by Walt Unsworth in his monograph Everest, p. 138), and after my personal observations of climbers on this feature in 1999 I am still struck how surprisingly well they matched Odell’s sighting (see Ghosts of Everest, p. 151, Detectives on Everest, p. 122, and Tatort Mount Everest, pp. 121ff.). However, my opinion has changed now.

The issue has been extensively covered in climbing literature (e.g. Detectives on Everest, p. 123f., and Tatort Mount Everest, pp. 173-185ff.) and on the internet, so this paper will again focus on the bare essentials:

Cadiach rated the headwall crux pitch UIAA V+ (5.7-5.8); Fritsche between IV+ and V- (5.6), with the last moves probably in the V+ (5.7-5.8) range; Conrad Anker is on record with ratings between 5.8 and 5.10 (V+-VI+), while Leo Houlding, after seconding the pitch, rated it 5.9 (VI). No rating is documented from Totmjanin.

Every climber who succeeded in a free ascent of the Second Step was afterwards optimistic about Mallory & Irvine’s ability to have overcome the pitch in 1924. Tempting as this might be, these opinions can hardly be considered “evidence” – they only show that the five climbers in question were able to climb the Second Step under similar conditions as in 1924.

Final proof for a successful ascent by Mallory & Irvine can only come through the discovery of conclusive traces above the Second Step or a picture from one of their cameras showing the terrain above the step.

In November 2010 I had the opportunity (together with two colleagues) to watch the movie The Wildest Dream, starring Conrad Anker and Leo Houlding, which features their free ascent of the Second Step.

When we watched the respective sequences of the movie, we were unanimously surprised – almost shocked even – how deceptively easy the crux looks on film. The headwall pitch is just four or five moves long (which can also be deduced from a still image in the accompanying book, The Wildest Dream, between p. 152-153), has positive incut holds and might even be slightly less than vertical. Anker was able to do a no-hand rest before exiting onto the ledge at the top of the pitch.

All in all, after watching Anker’s free-climb, it suddenly did no longer seem such a long shot that Odell had seen Mallory and Irvine climbing the Second Step headwall with “alacrity” and within the time of his sighting.

In our reconstruction of the events of June 8, 1924, for the Austrian TV documentary Erster auf dem Everest (First atop Everest, first aired on December 30, 2010) we therefore had Mallory and Irvine successfully climb the Second Step. We backed this opinion with an idea first voiced in 1999 by British climber-cameraman Jim Curran and later expanded by author Charles Lind in his book, An Afterclap of Fate (p. 108).

“When Mallory’s body was discovered, his watch was found inside his pocket. It was minus its crystal and also the minute hand was broken off and missing. Quite obviously it had been taken off and put there after it had been damaged. No traces of glass were found in his pocket. Mallory wore his watch on his left arm and facing inwards. The damage to the watch fits perfectly what would have happened if he had forgotten to take it off and attempted an arm jamming and levering climb. … And consider the fact that the watch has been carefully taken off and put away in his pocket. The watchstrap was thin and the buckle small, this was an operation requiring the removal of warm, outer gloves and the use of bare fingers. And it requires that at the time he did it, he was still in a sufficiently alert and well-functioning mental state to care enough to be bothered to do this and had the time. … You wouldn’t be fiddling about with your watch in a snowstorm [which engulfed the upper mountain between 2 and 4 pm; JH’s note] and after 4 pm, exhausted an with every minute of remaining daylight so vitally precious … This reinforces the argument in favour of the watch having been damaged whilst doing the crack climb of the Second Step.”

If Mallory & Irvine had successfully overcome the Second Step at 1 p.m., they would have been approaching the Third Step by the time the storm hit one hour later. Adding to the problem would have been the fact that their second and probably last pair of oxygen bottles was now finished.

A recent study of the weather situation in 1924 (Moore, K.G.W. et al., “Mallory and Irvine on Mount Everest: Did extreme weather play a role in their disappearance?”, Weather, vol 65, 8, August 2010) and interviews conducted with Austrian meteorologist, Karl “Charly” Gabl, for our documentary Erster auf dem Everest demonstrated that Mallory & Irvine were climbing into an approaching trough of low barometric pressure during their summit bid on June 8, 1924.

Mallory and Irvine would have been sheltered from the wind during the initial part of their ascent while the trough approached from the SW, but would have been fully exposed when the wind turned direction with the passing of the trough. Besides worsening climbing conditions (increased wind, precipitation, drop in temperature), the trough also led to a significant drop in barometric pressure, which would have compounded Mallory & Irvine’s hypoxic state after their oxygen supply had run out.

In my recent book about the Mallory research, Tatort Mount Everest, I wrote with regard to the question whether I believe that Mallory & Irvine (or one of them) had reached the summit (p. 234):

“I am still reluctant to give an answer – because to me ‘believing’ does to a large degree mean ‘not knowing’.”

However, given what is now known after years of research, three expeditions, and the recent production of the documentary Erster auf dem Everest I do not ‘believe’ that Mallory & Irvine (or one of them) climbed Mount Everest in 1924.

I would still give them an outside chance of having reached the summit if one of the following criteria was met and proven:

Mallory & Irvine had been higher than the Second Step (i.e. at the Third Step) when last seen by Odell at 12:50 p.m.

Mallory & Irvine had taken more than two (2) oxygen bottles each on the summit bit

And there are two important research tasks I’d like to see completed:

Confirmation of the discoveries of Chinese climber Xu Jing and Sherpa Chhiring Dorje, who both claim to have seen a body that is likely to be Andrew Irvine high on the Northeast Ridge (probably in the vicinity of the twin rock towers at 8440 m/27,690 ft.) in 1960 and 1995, respectively.
This also remains the last realistic chance of finding one of the climbers’ cameras.

A search of the plateau between the Second and Third Steps (8610-8690 m/28,250-28,510 ft.) for any traces, namely oxygen cylinders and pack frames

Both tasks need to be completed to gain the most comprehensive picture of what truly happened during Mallory & Irvine’s last climb on June 8, 1924.